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Gulvi NR, Patel P, Maliekal PJ, Badani PM. Effect of substitution on dissociation kinetics of C 2H 5X, (X = F, Cl, Br and I): A theoretical study. Mol Phys 2021. [DOI: 10.1080/00268976.2020.1807635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Nitin R. Gulvi
- Department of Chemistry, University of Mumbai, Mumbai, India
| | - Priyanka Patel
- Chemistry Department, G. N. Khalsa College, Matunga, Mumbai, India
| | | | - Purav M. Badani
- Department of Chemistry, University of Mumbai, Mumbai, India
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Sun J, Chu H, Wu W, Chen F, Sun Y, Liu J, Shao Y, Tang Y. A theoretical study on gas-phase reactions of acrylic acid with chlorine atoms: mechanism, kinetics, and insights. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:15772-15784. [PMID: 32088822 DOI: 10.1007/s11356-020-08100-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Accepted: 02/12/2020] [Indexed: 06/10/2023]
Abstract
Chlorine atoms initiated oxidation reactions are significant for the removal of typical volatile organic compounds (VOCs) in the atmosphere. The intrinsic mechanisms of CH2=CHCOOH + Cl reaction have been carried out at the CCSD(T)/cc-pVTZ//M06-2X/6-311++G(d,p) level. There are hydrogen abstraction and C-addition pathways on potential energy surfaces. By analyses, the addition intermediates of IM1(ClCH2CHCOOH) and IM2(CH2CHClCOOH) are found to be dominant. The secondary reactions of IM1 and IM2 have been discussed in the presence of O3, O2, NO, and NO2. And we have also investigated the degradation mechanisms of ClCH2CHO2COOH with NO, NO2, and self-reaction. Moreover, the atmospheric kinetics has been calculated by the variable reaction coordinate transition-state theory (VRC-TST). As a result, the rate constants show negative temperature and positive pressure dependence. The atmospheric lifetime and global warming potentials of acrylic acid have been calculated. Overall, the current study elucidates a new mechanism for the atmospheric reaction of chlorine atoms with acrylic acid.
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Affiliation(s)
- Jingyu Sun
- Hubei Collaborative Innovation Center for Rare Metal Chemistry, Hubei Key Laboratory of Pollutant Analysis & Reuse Technology, College of Chemistry and Chemical Engineering, Hubei Normal University, Cihu Road 11, Huangshi, 435002, Hubei, People's Republic of China.
| | - Han Chu
- Hubei Collaborative Innovation Center for Rare Metal Chemistry, Hubei Key Laboratory of Pollutant Analysis & Reuse Technology, College of Chemistry and Chemical Engineering, Hubei Normal University, Cihu Road 11, Huangshi, 435002, Hubei, People's Republic of China
| | - Wenzhong Wu
- College of Foreign Languages, Hubei Normal University, Cihu Road 11, Huangshi, 435002, Hubei, People's Republic of China
| | - Fang Chen
- Hubei Collaborative Innovation Center for Rare Metal Chemistry, Hubei Key Laboratory of Pollutant Analysis & Reuse Technology, College of Chemistry and Chemical Engineering, Hubei Normal University, Cihu Road 11, Huangshi, 435002, Hubei, People's Republic of China
| | - Yanan Sun
- Hubei Collaborative Innovation Center for Rare Metal Chemistry, Hubei Key Laboratory of Pollutant Analysis & Reuse Technology, College of Chemistry and Chemical Engineering, Hubei Normal University, Cihu Road 11, Huangshi, 435002, Hubei, People's Republic of China
| | - Jiangyan Liu
- Hubei Collaborative Innovation Center for Rare Metal Chemistry, Hubei Key Laboratory of Pollutant Analysis & Reuse Technology, College of Chemistry and Chemical Engineering, Hubei Normal University, Cihu Road 11, Huangshi, 435002, Hubei, People's Republic of China
| | - Youxiang Shao
- School of Materials Science and Engineering, PCFM Lab, Sun Yat-sen University, Guangzhou, 510275, People's Republic of China.
| | - Yizhen Tang
- School of Environmental and municipal Engineering, Qingdao University of Technology, Fushun Road 11, Qingdao, 266033, Shandong, People's Republic of China
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Vijayakumar S, Rajakumar B. An Exprimental and Computational Study on the Cl Atom Initiated Photo-Oxidization Reactions of Butenes in the Gas Phase. J Phys Chem A 2017; 121:5487-5499. [PMID: 28682612 DOI: 10.1021/acs.jpca.7b04783] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Temperature-dependent rate coefficients for the reactions of Cl atoms with trans-2-butene and isobutene were measured over the temperature range of 263-363 K using relative rate technique with reference to 1,3-butadiene, isoprene, and 1-pentene. The measured rate coefficients for the reactions of Cl atoms with isobutene and trans-2-butene are kR1298K= (3.43 ± 0.11) × 10-10 and kR2298K = (3.20 ± 0.04) × 10-10 cm3 molecule-1 s-1, respectively, at 298 K and 760 torr. Measured rate coefficients were used to fit the Arrhenius equations, which are obtained to be kR1-Exp269-363K = (4.99 ± 0.42) × 10-11 exp[(584 ± 26)/T] and kR2-Exp269-363K = (1.11 ± 0.3) × 10-10 exp[(291 ± 88)/T] cm3 molecule-1 s-1 for isobutene and trans-2-butene, respectively. To understand the reaction mechanism, estimate the contribution of each reaction site, and to complement our experimental results, computational studies were also performed. Canonical variational transition state theory with small curvature tunneling in combination with MP2/6-31G(d), MP2/6-31G(d,p), MP2/6-31+G(d,p), CCSD(T)/cc-pvdz, and QCISD(T)/cc-pvdz level of theories were used to calculate the temperature-dependent rate coefficients over the temperature range of 200-400 K. The effective lifetimes, thermodynamic parameters, and atmospheric implications of the test molecules were also estimated.
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Affiliation(s)
- S Vijayakumar
- Department of Chemistry, Indian Institute of Technology Madras , Chennai 600036, India
| | - B Rajakumar
- Department of Chemistry, Indian Institute of Technology Madras , Chennai 600036, India
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6
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Alwe HD, Sharma A, Walavalkar MP, Dhanya S, Naik PD. Formation of furan along with HO₂ during the OH-initiated oxidation of 2,5-DHF and 2,3-DHF: an experimental and computational study. J Phys Chem A 2015; 119:2793-801. [PMID: 25710388 DOI: 10.1021/jp5122454] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Experimental characterization of products during OH-initiated oxidation of dihydrofurans (DHF) confirms the formation of furan accompanied by the formation of HO2 to be a significant channel in 2,5-DHF (21 ± 3%), whereas it is absent in 2,3-DHF. Theoretical investigations on the reaction of OH with these molecules are carried out to understand this difference. All possible channels of reaction are studied at M06-2X level with 6-311G* basis set, and the stationary points on the potential energy surface are optimized. The overall rate coefficients calculated using conventional TST with Wigner tunneling correction for 2,5-DHF and 2,3-DHF are 2.25 × 10(-11) and 4.13 × 10(-10) cm(3) molecule(-1) s(-1), respectively, in the same range as the previously determined experimental values. The branching ratios of different channels were estimated using the computed rate coefficients. The abstraction of H atom, leading to dihydrofuranyl radical, is found to be a significant probability, equally important as the addition of OH to the double bond in the case of 2,5-DHF. However, this probability is very small in the case of 2,3-DHF because the rate coefficient of the addition reaction is more than 10 times that of the abstraction reaction. This explains the conspicuous absence of furan among the products of the reaction of OH with 2,3-DHF. The calculations also indicate that the abstraction reaction, and hence furan formation, may become significant for OH-initiated oxidation of 2,3-DHF at temperatures relevant to combustion.
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Affiliation(s)
- Hariprasad D Alwe
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400 085, India
| | - Asmita Sharma
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400 085, India
| | - Mohini P Walavalkar
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400 085, India
| | - Suresh Dhanya
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400 085, India
| | - Prakash D Naik
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400 085, India
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